Water gun



FIG. 1 is a perspective view of a water gun in accordance with our new design;

FIG. 2 is a right side elevational view thereof, the left elevational view being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a water gun, as shown and described. 